Revise DOCS.md for configuration instructions

Updated configuration instructions in DOCS.md to improve clarity on disabling audio, Bluetooth, and WiFi, along with optimizing cmdline.txt.

birdnet-pi/DOCS.md

@@ -275,17 +275,37 @@ sudo nano /boot/firmware/config.txt
 Paste in:
 
 ```ini
-dtparam=audio=off          # Disable the default onboard audio to prevent conflicts
+# ── Audio ──────────────────────────────────────────────────────
-dtoverlay=disable-bt        # Disable onboard Bluetooth to reduce USB bandwidth usage
+dtparam=audio=off
-dtoverlay=disable-wifi      # Disable onboard wifi
 
-start_x=0
+# ── Disable radios (RF + background jitter) ─────────────────────
+dtoverlay=disable-wifi
+dtoverlay=disable-bt
+
+# ── Headless / minimal firmware probing ─────────────────────────
 gpu_mem=16
+start_x=0
 camera_auto_detect=0
 display_auto_detect=0
+disable_splash=1
+
+# ── Optional: only effective on newer Pi4B revs / Pi 400 ────────
+arm_boost=1
 hdmi_blanking=2             # Disable HDMI (save power and reduce interference)
 ```
 
+- **Optimize cmdline.txt**
+
+```bash
+sudo nano /boot/firmware/cmdline.txt
+```
+
+Paste in:
+
+```ini
+console=serial0,115200 console=tty1 root=PARTUUID=2f0ecb16-02 rootfstype=ext4 fsck.repair=yes rootwait cfg80211.ieee80211_regdom=FI dwc_otg.fiq_enable=0 dwc_otg.fiq_split_enable=0 dwc_otg.fiq_fsm_enable=0 dwc_otg.lpm_enable=0 usbcore.autosuspend=-1 snd_usb_audio.nrpacks=1 threadirqs
+```
+
 - **Disable useless services**
 
 ```bash